Coated paper and process of manufacturing same



Nov. 4, 1930. A w. w. MCLAUARIN 3 COATED PAPER AND PROCESS OF MANUFACTURING SAME Filed Nov. 6, 1926 INVENTOR wwmm'fi Patented Nov. 4, 1930 UNITED STATES WILLIAM WALLACE MCLAURIN, F BROOKFIELD, MASSACHUSETTS COATED YAPER AND PROCESS OF MANUFACTURING SAME Application filed NovemberG, 1926. Serial No. 146,630.

This invention relates to coated papers and to processes of manufacturing such papers. In coating paper for high-grade printing or engraving a coating material is used which tends to harden and stiffen the sheet so that the finished paper will have a smooth hard surface. When such a paper is used for pamphlets, folders, or the like, where it is necessary to fold or crease the printed sheet, the paper breaks or cracks along the lines of folding. If it is attempted to modify the coating so as to produce a more pliable paper, the result is to impair the printing qualities of the sheet.

The present invention deals with the problem presented by these conditions, and it aims to overcome the objection above described. In other words, the invention aims to provide a coated paper for high-grade printing or engraving which can also be folded Without breaking.

The nature of the invention will be readily understoodfrom the following description when read in connection with the accompanying drawings, and the novel features will be particularly pointed out in the appended claims.

The single figure of the accompanying drawing is a diagrammatic perspective view illustrating a process of strip coating paper embodying the present invention.

According to the process illustrated in the drawing, a continuous strip S of paper is drawn-from the supply roll 2 and travels over a roll 3 having raised peripheral portions or rings 4 with which the paper is held in contact by means of another roll 5. The coating material is applied to certain areas or strips of the web S by the rings 4. A supply of the coating material is held in a tank 6, and a feed roll 7 which is partly submerged in the liquid coating material transfers it to an intermediate roller 8, usually covered with felt, which, in turn, delivers the material to the rings 4 of the strip roll 3. This arrangement ensures the application of a limited and substantially uniform quantity of coating material to the paper. Strips of coating so applied are indicated at A. This coating should be relatively hard, that is, adapted 'to impart to the finished sheet the hard, smooth surface which is desired for highgrade printing or engraving. Such coatings are well known to the. trade so that no spe cific composition of a coating material need I be given here. A typical coating compound may consist of clay, blanc fixe, satan white, and a suitable pulp color, together with a casein or glue sizing and water.

The paper next runs'over a roll 9 and into contact with another strip roll 10 having one or more annular portions'or rings 12 to run in contact with the' surface of the paper which has not already been coated by the strip roll 3. The rings 12 apply to the uncoated sections of the paper a coating of material which gives to the paper a softer and more pliable finish than the coating previously applied. Such a compound, for example, may include the same ingredients as the coating material above specified, and,

in addition, certain softening materials, such as glycerine or glucose, or possibly fatty or oily constituents in limited quantities, as will be readily understood by those skilled in this art. This material is mixed with water and the mixture fed to the strip roll 10 by a feed roll 14 and a transfer roll 15 in substantially the same manner that the hard coating compound is fed to the strip roll 3. The strip 8n coatings applied by the roll 10 are indicated at B. From the latter roll the web of paper travels over guide rolls 16 and 17 and is then wound up on a roll 18, suitable time being allowed in the travelof the strip to enable Bl the coating to dry. If desired, the web may be run over one or more heated rolls or drying drums to hasten the drying operation.

In applying the coating materials to the paper doctors or scrapers may be used on the feed rolls where a more accurate control of the thickness of the coating is required than can be obtained by the mechanism above described. Preferably the two coatings are of substantially the same thickness so that a level sheet is produced.

In performing the coating operation the width and shape of the areas coated are predetermined with reference to the sheet to be printed so that the printing will be done on 0 the part A of the paper which has the harder icoating, and the line or lines of fold will come on-the strip B, which is softer and more pliable. In case it is desired to have the softer coated areas B extend both across as well as longitudinally of the sheet, the strip rolls 3 and can .be modified in shape to give this result, as will be evident to those familiar with paper coating operations.

paper having dryand non-adhesive coatings,

adjacent areas having quite differentcharacteristics, the hard coated areas being admirably adapted for high-grade printing, While the adjacent arcas carryingthesofter coating are especially adapted for folding and creasing.

It will be understood that the particular 1 way in which the coatings are applied, the widths and shape of'the areas coated, and thelike, will be determined bv the use which is to be made of thelpaper. l-Vhile. therefore, I have hereinlshown and described a typical arrangement for practicing the present in vention, it will be understood that the process provided by this invention may be practiced in other-ways Without departing from the spirit. or scope of the invention. Having thus described my invention, what -I desire to claim as new is:

1. .That improvement in processes of manufacturing coated papers which consists in applying a hard coating of non-adhesive material adapted to facilitate printing to a strip of the area of said paper, and applying a The process above described produces a portion of said surface being coated with a softer non-adhesive material adapted to facilitate folding.

6."An article of the character described consisting of paper having on one face thereof adjacent strip coatings, one adapted to give the paper a hard finish and the other adapted to produce a more pliable finish, both'of said coatings being non-adhesive;

WILLIAM WALLACE MQLAURIN.

,softer coating of non-adhesive material 'to an adjoining strip of the surface of the paper.

l 2. That improvement in processes of strip coating paper which consists in applying a 4.0 coating of material adapted to produce a hard finish on the surface of the paper in spaced strips on said surface, and coating the intervening surface of the paper with a ma terial adapted-t0 produce a softer and more 'a pliable finish, both of said coatings being non-adhesive. L

3. An article of the character described consisting of paper having adjacent portions of the surface thereof coated with different 0 compositions, the coating on one portion being adapted to render the paper hard and that on another portion making the paper more pliable, both of said coatings being nonadhes ve. I

4. An article of the character described comprising, paper with a relatively hard coating thereon to facilitate printing, and a softer strip coating interrupting said hard coating an facilitating folding, both of said 00 coatings being non-adhesive.

5. An article of the character described comprising paper, the greater part of the surface on one side thereof being coated With a relatively hard non-adhesive material adapted to facilitate printing, an adjacent 

